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Title: Localization of isolated holes in Mott insulator and delocalization by pairing
Authors: Kumar, N.
Issue Date: 1990
Publisher: The American Physical Society
Citation: Physical Review B, 1990, Vol. 42, p6138
Abstract: I have calculated the ground-state energy and wave function of a single (pair of) hole(s) moving in a two-dimensional antiferromagnetically correlated background in the self-retracing-path approximation within the t-J model. The confining potential due to the string of overturned spins is treated quasistatically in the strong-coupling limit. I find that (i) an isolated hole is autolocalized at discrete energy levels, broadened presumably into narrow resonances due to failure of the quasistatic approximation, (ii) a pair of holes bind for J/t>0.45 in the dilute limit δ→0, but (iii) higher concentration favors delocalization of holes by pairing. This has observable consequences for the normal-state transport and optical absorption in the high-Tc cuprate superconductors.
Description: Restricted Access
ISSN: 1098-0121
1550-235X (Online)
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Copyright: 1990 The American Physical Society
Appears in Collections:Research Papers (TP)

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